开盘：美股周一低开 AI相关股票普跌

Core Viewpoint - The U.S. stock market opened lower on December 29, with AI-related stocks experiencing a general decline as traders prepare to close out a strong 2025 [1][5]. Group 1: AI Stocks Performance - Key AI stocks such as Nvidia, Micron Technology, and Oracle saw declines on Monday after recording solid weekly gains, with Nvidia rising over 5%, Micron up approximately 7%, and Oracle increasing by about 3% last week [3][7]. Group 2: Market Indices and Trends - The S&P 500 index reached an intraday high of 6945.77 points last week, despite a drop on Friday. The index has increased nearly 18% year-to-date, while the Dow Jones is up 14.5%, potentially marking its best annual performance since 2021. The Nasdaq Composite has performed even better, with a year-to-date increase exceeding 22% [3][8]. - The market is currently experiencing a "Santa Claus rally," a historically strong period for stock performance at year-end. According to the Stock Trader's Almanac, the S&P 500 has averaged over a 1% gain during the last five trading days of the year and the first two trading days of the following year since 1950 [8]. Group 3: Federal Reserve Insights - Federal Reserve Chairman Jerome Powell, whose term ends in May 2026, commented on stock market valuations, indicating that stock prices are at relatively high levels according to multiple indicators. He emphasized that the FOMC considers overall financial conditions when making policy decisions [4][9].